MariaDBServerKnowledgeBase.pdf downloaded file is corrupted

The downloaded pdf file of the MariaDB server documentation (see https://mariadb.org/wp-content/uploads/2023/11/MariaDBServerKnowledgeBase.pdf) is corrupted (detected December 9, 2023); it cannot be viewed in regular PDF viewers (especially Acrobat readers).

I have tried various online conversions to "workaround" the problem, but without success.
Anyway, it seems the corruption is in the 1st page (documentation cover) because when the full documentation is split after page 1, the resulting pdf (having 1 page less than the full documentation) is clean and can be viewed.

Note that Internet browsers (tested with Firefox & Edge) are not affected by this problem and can browse the documentation pages normally.
Additionally, printing to PDF from these browsers fixes the issue, but the resulting PDF does not contain any internal links between the pages and the table of contents and the pages. So, using such a large document without internal links is painful.